Albacore continued

[greenman407]

So, here we go with our new sail. I got it sanded down but I didnt get a picture of that. Im going to do some additional scribing. The grill in the upper rear of the sail to be specific. Nothing extensive.

[greenman407]

Just got off the phone to Mcmaster&Carr. They are sending out my 3&1/2" tube. Well!.......................its a start

[Slats]

Fantastic Mark.....


now Merriman you bum, finish ASSWIPE up pronto.

[greenman407]

I LIKE IT! However.....it would look better if it were on my sub.

[He Who Shall Not Be Named]

LOOKY, LOOKY!!! LOOK WHAT JUST ARRIVED FROM "THE CAVE"!! Once again Dave Merriman has come through with a work of art! We all saw how Dave posted about his new Albacore hull and sail with the built in rudder. I dropped a few well timed "hints" about wanting to retrofit one on my Phase IV X-tail. Well it seems to have worked because I am now the proud owner of one of those sails. Im sorry about the photography as these pictures do not do it justice. Its beautiful!
Im going to start work right away on it as the top has to be CAed on and the seam filled. Ive decided not to put a periscope on this sail or to open up the cockpit area to eliminate the resulting drag. And now..........BEHOLD!
[ATTACH=CONFIG]29534[/ATTACH][ATTACH=CONFIG]29535[/ATTACH][ATTACH=CONFIG]29536[/ATTACH]

The end-game (have not yet painted the 'clear' parts)

[greenman407]

LOOKY, LOOKY!!! LOOK WHAT JUST ARRIVED FROM "THE CAVE"!! Once again Dave Merriman has come through with a work of art! We all saw how Dave posted about his new Albacore hull and sail with the built in rudder. I dropped a few well timed "hints" about wanting to retrofit one on my Phase IV X-tail. Well it seems to have worked because I am now the proud owner of one of those sails. Im sorry about the photography as these pictures do not do it justice. Its beautiful!
Im going to start work right away on it as the top has to be CAed on and the seam filled. Ive decided not to put a periscope on this sail or to open up the cockpit area to eliminate the resulting drag. And now..........BEHOLD!

[Subculture]

I use a puller to remove press-fit pinions. They usually come off without much fuss, although steel hardened gears can be a swine, and I sometimes have to file them down a bit to get them loose (in an instance where it's the motor I'm trying to salvage).

[He Who Shall Not Be Named]

Mark, you are one determined SOB, aren't you!? You just keep punching till you get where you're going. I like that.

I trill the pinion bores to be a very tight interference fit to the motor drive shaft and hammer them down onto the shafts.

M

[greenman407]

IT IS DONE! Installed. Dave, what do you use to affix the brass gears to the motor shaft? OMG!!! I heated them for 45 seconds with a propane torch and still couldnt getem to come loose. I had to cut the motor shaft and drive the shaft out of the gear with a pin punch. Green Sleeve retainer was used to re install the gear on the new motors. Now Ill have to get some 3&1/2" lexan tube on the way. Oh yes, I had to remove the field sleeves off the outside of the new motors to get enough clearance to get them to fit inside the Lexan without hitting.

[greenman407]

Yep, thats what makes a hot air balloon rise, Hot Air. But, so far, apparently the small quantity of air in the Subdriver motor compartment hasnt been enough to do that. That coupled with the motors reaching a relatively low temperature of 140 degrees. Ive melted down two Speed 400s in there before and no blowing off of the endcap. So hopefully that wont happen.

[He Who Shall Not Be Named]

The fan in a closed space won't change the net pressure within. Local pressure changes yes; but the differential within will be zero. You're good.

However, Charles Law says not to raise the temperature in there too much or you will pop a bulkhead off.

YOU NUT!!!!!

What are you ... some kind of dynamometer?

M

[greenman407]

As good as my word. Just got these yesterday. Using my volt/ohm meter, set on DC amps, I got .25 amps no load on the 12 volt Caswell motors, so we will use that as a bench mark. The new motors pull .45 amps no load. To test torque output I used a very precise and ingenious method. I put on a leather work glove and tryed to stop the spinning motor shaft. On the Caswell motor, I was surprised at how strong it was. But I was able to stop its rotation by squeezing between gloved thumb and forefinger, running at full RPM on a 3 cell Lipo. The new motor, however there was no stopping it. I was able to slow it down somewhat, but I could not stop it.
So, there you have it Folks.....a very precise and reliable way to test your motors. Did I mention that I charge for this service???
At any rate , I plan on putting two of these motors in the Duo-prop, X tail Albacore when I redo the WTC. Also Im going to stick one in the 1/72 Revell/Caswell/Merriman Skipjack. Yep, I plan on adding more ballast weight and upper end foam to try to help keep it from becoming a High Speed Drill Bit. Bonapetit. Oh, did I mention that the new motors are fan cooled. I dont know if thats good or bad inside a confined space like a Subdriver. In the pictures , the New motor is on the left.

[Subculture]

Not really the case. It's difficult to find good quality low RPM motors wound for lower voltages.

Going to higher voltage tends to mean thinner cables, as you're pulling less current for equivalent power and it's easier on the batteries (barely an issue with lipo's though).

[greenman407]

Andy, In your situation, if I understand you correctly, is that the 540s were running on 6 volts and your 385s were running on 12 volts. It seems to me that the switch from 6 volts to 12 volts is what netted your increase. Correct me If I am jumping to conclusions.

[greenman407]

Good point in your specific application. My work with the Seaview and the Albacore over the last 8 years as a history base and the recent improvement in the performance output of the Seaviews mods. convinces me that in these cases, there is room for more Torque(twisting power). The increase netted by swapping over from Speed 400s to 540s is on the order of increase x 5. When the motors arrive I will test there output and post it here. For these two submarines, power is the most important consideration, power usage is secondary.